Saw guard



Aug. 14, i923.. L4M-,9241

vv. D` DRUMMOND SAW GUARD Filed June 20, 1922 2 sheets-sheet 1IN'VENTOR.

22222;.; zam

ATTORNEY Y B O `l\ s a o 5 5 8 8 M 25 5 3. .L T

Aug. M, 1.923. Mlml w D. DRUMMOND SAW rUARD Filed June 20. 1.922 2Sheets-Sheet 2 ATTORNEY 6" INVENTOR.

Patented ug. i4, i923.

WILLIAM i). Denuncian, 'or New Yoeri, n. Y.

alt 107mm t may concern.' Be 1itlrnovvn that .LVWInLrAgM D- `DRUM-Morin, citizenLott-he United States, residT iig `at New Yorin(V inithecoun'ty y of New 5 York andState of New Yorlrfliave invented4)certain nerv rand .usati-'1h Improvements in Saw Guards, of.ivhichjthe ffollowing is `a i LM'yinvention relates to guards fiorcircular fsaivs, andH the .essential objects Y. oft :my 'inventionare-toenable .,Vthe `.guard 'tobe 1utilized upon either astationary-orfswinging sawfiorrsawsj'to Venalolefthe guard to be mountedindependently of the :saw frame; togprotect the operatoreat gall timesincluding the period of the sawing -zoperatiorn` and to attain theseends in a compact, .inexpen- V sive and automaticallyop'erablestructure.

l. E Vof .Figure :la

Figure l3, a front elevation, partially `in section of onevor1 theguards innormal position, L y i Figure 4, a like elevation ,of the -sameduring. a portion ofthe :sawing operation,

, igurer, airont elevation of one-ofthe guards,l partially.in .sectionyon line 5,-5 `of Ei'gure 2,near the V.close of: the .sawing voperation.

y Like. Vreference `characters indicate elike paflrtsthroughout theviews. Y In the drawings 'Y'V isarly usual creen:- venient saw`{fram-e,including the table "8 and :framework .9 in. which ismountedlthe the Wheel 16, all as usual.

VshaitmlO.carrying the Vvvorm Wheel 12emgaged by theV `Wormfl of shaftVlleialso mounted inthe .framework and-movable by The common spindlearm.-18 isintermediate itsfflength fast gtoythe shaft ll0 `having -upen` its`opposite-ends thebearings 20 rfor the-spindles or arbore 21;:Ca-rryingthedriving rolls 22. V23 and-24 are the `guide and tension rollsfof vthedriving-belt 25 adaptedwtoengageeither SAW GUn-RD.

Application filed `-J'1'ine2(), 1922. Serial o. 569,707.

offthe rolls 22 to rotate its `savv 26. It is in vconjunction with thedescribed or other familiar saw frames andfparts that my in- `ventionWill be herein described.

Each spindle has upon its endthe usual nut 80. T he outer yand-innercollars Slfand 32 embrace the saw 26. The latter collar has a`peripheral flanged portion lleform.- ing a resultant seat 35 for :anannular cire cularly m-ovablehub 37 of rectangular' cross sectionprovided with an annular recess 38 and a peripheral flange 39. IntegralWith the hub isa Ysegmental lplate 40 `provided with a laterallydirected peripheral flange '41 terminating in a lip l21upon one end.

A Rotatably `mounted. on'the hub 3.7 and vClosing the recess or channel38 vis a ringor hub lslidably engaging the iianges 34 and 39 andcarryingan integral segmental plate 47 having a lateralperipheral'flange 48terminating in a lip 49.

In 'the recess 38 is a helical retractile spring 5l attached at its endsto pins 53 and `54 :tast in the members 37 and l5 respectively. Thisspring serves to normally maintain Yiii-contact with eachotherthe tivoadjacent edgesotthe segmental-plates. In this instance the plates et()and 47 have internal arcuate marginal bearing or'spacin'g ribs 57 and 58respectively; and Athe circular iria-nge 39 has a circular bearing rib59. These `ribs .are slidably engaged by the saw. The following vmeans-is convenient tor preventing excessive travel of the lplates 4'? towardthe -Work-,andto keep the lip i9 in alignment With-the t'op of'thetable.A linlr G2V is pivoted loya pin 63 `tothe end of a plate TI-oppositethe' lip 49 and hasan intermediate lateral inger 64e. A flink is pivotedby apinl to an A.arm-66. in arm is pivotally attached tothe sauT `iframeor some part carried thereby. In this instance the arms are 4looselyVpivoted tojthe sha-ift l0 through an integral ring portion 68. Thelatterfportions are -looselyembraced by `collars fast to the shaft l0.In Figure l a linger 64 is shown stopped at itsextreme of `travel-bvcontact with a `preiecting portion .7l of -the machine frame. To illuswtrate Ythe aetionfof the guards abloclrto he' saWed `'ris shown inFigures 3; 4 and 5, as moving in the y.direction of the arrow;A andwhich impels the -plate 47, andfthrough the spring 51 causes the plate40 to closely follow the block thus continuously housing the saw teethby the flanges 48 and 41. When it is desired to use the lower of the twosaws it will be found that the guard structures lend themselves withoutremoval from their positions upon their respective saw spindles to suchreversal when the member 18 is rotated or swung upon its axis. This isone important advantage of the non fixed character of my construction.

The link 62 and the arm 66 constitute an anchoring` device to keep theguard member V47 from rotating with the saw. The stop 64 serves only asa stop for the guard when the saw is at an angle of 45o or any otherangle past the center.

It is to be noted that the guard is mounted on the arbor of the saw and,consequently, is under the Contact of the friction between the collar 32and the hub 37 so that the parts 40 and 47 are normally in the positionin which they are shown in Figures 1 and 3.

The part 47 is moved in the direction `of the passage of the materialbeing cut byj the pressure of such material upon the lip. 49 and ismoved thereby until the said lip is caused to extend below the upperface of the table 8, as seen in Figure 4, the member 40 being held downby the pressure of the material upon the lip 42, as seen'y in Figure 3,and when the rear end of said material has passed said lip the guardmember 40 follows the material being moved, by the action of the spring51, the said member 40 following the end of the material, as seen inFigure 5, thus guarding Vthe saw, so that the teeth thereof are neverexposed and, hence, all danger to the operator is avoided. After thematerial has been cut and passed beyond the lip 49, the parts areautomatically returned to normal position, that seen in Figures 1 and 3,by the return of the saw to its normal position, ready for a similaroperation on the neXt piece of material.

It will be understood' that my device is successfully operable withoutthe anchoring devices 62 and 66 or any other device of a similarcharacter, and in instances where only a single stationary saw ismountedin the frame the anchoring mechanism is customarily omitted. Theauxiliary mechanism has its chief value in conjunction with the use of aplurality of saws movable relatively to each other or with a singlenon-v stationary saw, such for instance as universal saws.

I claim 1. A saw and its arbor, and a guard for the saw mounted on saidarbor and comprising two independently movable members frictionally heldin normal position and both mounted on the same arbor.

Q. A saw and its arbor, a guard for the saw mounted on said arbor andcomprising two independently movable Ymembers frictionally held innormal position and both mounted on the same arbor, and an anchoringdevice for one of said members.

3. A, saw and its arbor, a guard for the saw mounted on said arbor andcomprising two independently movable members frictionally held in normalposition and both mounted on the same arbor, and an anchoring device forone of said members, said anchoring device being provided with a stopmember. p

4. An oscillatorily-mounted saw, anda guard therefor comprising twomembers both mounted upon the said arbor and oscillatory with the saw,both movable together in one direction and independently of each otherin the other direction.

5. An oscillatorily-mcunted saw, a guard therefor mounted upon the saidarbor Vand oscillatory with the saw, and an anchoring device for saidguard to prevent its rotation with the saw.

6. An oscillatorily-mounted'rotary cutter, and a guard therefor,comprising two members, one of said members movable relatively totheother and both'mounted on the saw arbor.

7. An oscillatorily-mounted rotary cutter, a guardtherefor, comprisingtwo members, one of said members movable relatively to the other andboth mounted on the saw arbor, an anchoring device for one member,

Aand a spring for returning the other member'to its normal position. V

8. In a circular saw guard, ahub provided with a recess, a segmentalplate upon the hub, a ring rotatably mounted on thev hub enclosing therecess, a segmental plate .on the ring, guard flanges on the plates,lips on the adjacent ends of the flanges, and a spring in the recessfast at itsopposite' ends to the hub and collar. Y Y

9.v A saw and its arbor, and a guard vfor said saw comprising twomembers mounted independently of each other on the arboro the saw andmovable in one direction with each other and in the other directionindependently of each other. i A

10. A saw and itsarbor, a guard for said saw comprisingtwoqmembers'mounted independently of each other on the arbor of the sawand movable in one direction with each other and in the other directionindependently of each other, means for anchoring one ofsaid members, anda spring acting on theother member to move it in one direction.

11. 'A Vsaw and its arbor. aguard for said saw comprising two membersmounted independently of ,each other on the arbor of the saw and movablein one Vdirection with each otherand in the other directionindependently of each other, means Yfor anchoring one of said members, aspring acting on the other member to move 1t 1n one direction, andfriction means for returning both of said members to their normalposition.

l2. A saw and its arbor, a guard for said saw comprising two membersmounted indeloendentlj)r of each other on the arbor of the sawandmOVable in one direction With each other and in the other directionindependently of each other, means for anchoring one of said members, aspring acting on the other member to move it in one direction, andfriction means for returning both of said members to theirlnormalposition, said saw being oscllatorily-mounted.

In testimony whereof I have afiiXed my signature.

WILLIAM D. DRUMMOND.

